Antenna design analyses performed in an earlier program phase (ARBAT System Design Study) were validated and used in the final development and fabrication of an 'X' band phase/frequency mechanical scanning radar antenna to be incorporated in a radar system for ballistic ammunition acceptance testing. The antenna is a 10 by 12 ft aperture planar array. Elevation scanning is accomplished by phase changes produced by digitally controlled 4 bit diode phase shifters. Scanning in azimuth is by frequency variation and mechanical rotation of the array. Development steps included fabrication and testing of individual critical items and assemblies of critical items to estimate fully array performance. A 9 element partial array was range tested prior to fabrication of the required 167 horizontal array elements and associated microwave elements. The mechanical and electrical design is discussed and test results are summarized.

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